I have been experiencing a situation where the red battery dash light illuminates periodically. After starting the bus it will start to come on about five minutes into driving. It begins by flickering and then after 15 or 20 minutes it will be glowing red. Once stopped it may stay on for a while or flicker or yesterday it went off. Then when I started coach again 15 minutes later it was back on. Here are the things I have done:

Adjusted alternator output to confirm it was within parameters

Replaced Vanner battery monitor

Checked all Battery terminals

Other than the light there doesnt appear to be anything wrong. It does seem to flicker when accelerating making me think a loose connection or ground but I wouldnt know wherer to begin to look. I am thinkin about once it illuminates to begin removing connectors off the Vanner to try and isolate it that way....any thoughts,should I just sell the coach?